src/cli_ip.c

   1 /*
   2  * Mausezahn - A fast versatile traffic generator
   3  * Copyright (C) 2008-2010 Herbert Haas
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License version 2 as published by the
   7  * Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  11  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
  12  * details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html
  16  *
  17 */
  18
  19
  20
  21 #include "mz.h"
  22 #include "cli.h"
  23 #include "mops.h"
  24
  25
  26 // ------- TOC ---------
  27 //
  28 // int     cmd_ip_address_source       (struct cli_def *cli, char *command, char *argv[], int argc)
  29 // int     cmd_ip_address_destination  (struct cli_def *cli, char *command, char *argv[], int argc)
  30 // int     cmd_ip_version              (struct cli_def *cli, char *command, char *argv[], int argc)
  31 // int     cmd_ip_ttl                  (struct cli_def *cli, char *command, char *argv[], int argc)
  32 // int     cmd_ip_protocol             (struct cli_def *cli, char *command, char *argv[], int argc)
  33 // int     cmd_ip_hlen                 (struct cli_def *cli, char *command, char *argv[], int argc)
  34 // int     cmd_ip_len                  (struct cli_def *cli, char *command, char *argv[], int argc)
  35 // int     cmd_ip_id                   (struct cli_def *cli, char *command, char *argv[], int argc)
  36 // int     cmd_ip_offset               (struct cli_def *cli, char *command, char *argv[], int argc)
  37 // int     cmd_ip_sum                  (struct cli_def *cli, char *command, char *argv[], int argc)
  38 // int     cmd_ip_tos                  (struct cli_def *cli, char *command, char *argv[], int argc)
  39 // int     cmd_ip_dscp                 (struct cli_def *cli, char *command, char *argv[], int argc)
  40 // int     cmd_ip_rsv                  (struct cli_def *cli, char *command, char *argv[], int argc)
  41 // int     cmd_ip_df                   (struct cli_def *cli, char *command, char *argv[], int argc)
  42 // int     cmd_ip_mf                   (struct cli_def *cli, char *command, char *argv[], int argc)
  43 // int     cmd_ip_option               (struct cli_def *cli, char *command, char *argv[], int argc)
  44
  45
  46
  47 // ip-address source default|<IP>|rand|range
  48 //
  49 //   default
  50 //   random
  51 //   A.B.C.D
  52 //   A.B.C.D  /24
  53 //   A.B.C.D  E.F.G.H
  54 int cmd_ip_address_source (struct cli_def *cli, char *command, char *argv[], int argc)
  55 {
  56    u_int8_t IP1[4], IP2[4];
  57    u_int32_t ip1, ip2;
  58    unsigned int prefix;
  59    u_int32_t mask, invmask;
  60    int i,r;
  61
  62    if ( (strcmp(argv[argc-1],"?")==0) || (argc>2) )
  63      {
  64         cli_print(cli, "A.B.C.D     configure a source IP address\n");
  65         cli_print(cli, "Optionally you may specify\r");
  66         cli_print(cli, "- a range of addresses, such as: 192.168.0.0 /16\r");
  67         cli_print(cli, "                             or: 192.168.0.1 192.168.255.255\r");
  68         cli_print(cli, "- 'random' for a randomly generated source address\r");
  69         cli_print(cli, "- 'default' for the interface default settings\n");
  70         return CLI_OK;
  71      }
  72
  73    switch (argc)
  74      {
  75       case 1:
  76         if (mz_strcmp(argv[0], "default", 3)==0)
  77           {
  78              // find index of device_list with the device configured in clipkt:
  79              i=0;
  80              while (strncmp(device_list[i].dev, clipkt->device, 10) && (i<device_list_entries)) i++;
  81              clipkt->ip_src = device_list[i].ip_mops[3]
  82                             + device_list[i].ip_mops[2] * 256
  83                             + device_list[i].ip_mops[1] * 256 * 256
  84                             + device_list[i].ip_mops[0] * 256 * 256 * 256;
  85              clipkt->ip_src_israndom = 0;
  86              clipkt->ip_src_isrange = 0;
  87           }
  88         else if (mz_strcmp(argv[0], "random", 3)==0)
  89           {
  90              clipkt->ip_src_israndom = 1;
  91              clipkt->ip_src_isrange = 0;
  92           }
  93         else if (mops_pdesc_ip (IP1, argv[0])==0) // check if format is really an IP address
  94           {
  95              clipkt->ip_src =  str2ip32(argv[0]);
  96              clipkt->ip_src_israndom = 0;
  97              clipkt->ip_src_isrange = 0;
  98           }
  99         else // wrong input
 100           {
 101              cli_print(cli,"Invalid address/keyword\n");
 102           }
 103         break;
 104       case 2: // MUST be either like '10.1.1.0 /24' or '10.1.1.1 10.1.1.254'
 105         if (mops_pdesc_ip (IP1, argv[0])==0) // check if format is really an IP address
 106           {
 107              clipkt->ip_src_start = str2ip32(argv[0]);
 108              if (strlen(argv[1])<4) // probably prefix?
 109                {
 110                   r=sscanf(argv[1],"/%u",&prefix);
 111                   if ((r==EOF) || (r==0) || (prefix<1) || (prefix>31))
 112                     cli_print(cli, "Invalid prefix!\n");
 113                   else
 114                     {
 115                        mask = 0xffffffff;
 116                        mask <<= (32-prefix);
 117                        invmask = 0xffffffff - mask;
 118                        ip1 = ((str2ip32 (argv[0])) & mask) +1; // the '+1' is to ensure that we do not start with the net-id
 119                        ip2 = ip1 | invmask;
 120                        clipkt->ip_src_start    = ip1;
 121                        clipkt->ip_src_stop     = ip2;
 122                        clipkt->ip_src_isrange  = 1;
 123                        clipkt->ip_src_israndom = 0;
 124                     }
 125                }
 126              else if (mops_pdesc_ip (IP2, argv[1])==0) // probably 2nd IP address?
 127                {
 128                   if (str2ip32(argv[1]) > clipkt->ip_src_start)
 129                     {
 130                        clipkt->ip_src_stop = str2ip32(argv[1]);
 131                        clipkt->ip_src_isrange  = 1;
 132                        clipkt->ip_src_israndom = 0;
 133                     }
 134                   else
 135                     {
 136                        cli_print(cli, "Invalid range! The second IP address must be greater than the first!\n");
 137                     }
 138                }
 139              else
 140                {
 141                   cli_print(cli, "Second parameter must be either a valid IP address or a prefix length \n");
 142                }
 143           }
 144         else // first string is not a valid IP address
 145           {
 146              cli_print(cli, "First parameter must be a valid IP address\n");
 147           }
 148         break;
 149       default:
 150         cli_print(cli, "Invalid format!\n");
 151      }
 152
 153    return CLI_OK;
 154 }
 155
 156
 157
 158 // ip-address destination <IP>|range
 159 int cmd_ip_address_destination (struct cli_def *cli, char *command, char *argv[], int argc)
 160 {
 161    u_int8_t IP1[4], IP2[4];
 162    u_int32_t ip1, ip2;
 163    unsigned int prefix;
 164    u_int32_t mask, invmask;
 165    int r;
 166
 167    if ( (strcmp(argv[argc-1],"?")==0) || (argc>2) )
 168      {
 169         cli_print(cli, "A.B.C.D     configure a destination IP address\n");
 170         cli_print(cli, "Optionally specify a range of addresses, such as: 192.168.0.0 /16\r");
 171         cli_print(cli, "                                              or: 192.168.0.1 192.168.255.255\n");
 172         return CLI_OK;
 173      }
 174
 175    switch (argc)
 176      {
 177       case 1:
 178         if (mops_pdesc_ip (IP1, argv[0])==0)  // check if format is really an IP address
 179           {
 180              clipkt->ip_dst =  str2ip32(argv[0]);
 181              clipkt->ip_dst_isrange = 0;
 182           }
 183         else // wrong input
 184           {
 185              cli_print(cli,"Invalid address/range\n");
 186           }
 187         break;
 188       case 2: // MUST be either like '10.1.1.0 /24' or '10.1.1.1 10.1.1.254'
 189         if (mops_pdesc_ip (IP1, argv[0])==0) // check if format is really an IP address
 190           {
 191              clipkt->ip_dst_start = str2ip32(argv[0]);
 192              if (strlen(argv[1])<4) // probably prefix?
 193                {
 194                   r=sscanf(argv[1],"/%u",&prefix);
 195                   if ((r==EOF) || (r==0) || (prefix<1) || (prefix>31))
 196                     cli_print(cli, "Invalid prefix!\n");
 197                   else
 198                     {
 199                        mask = 0xffffffff;
 200                        mask <<= (32-prefix);
 201                        invmask = 0xffffffff - mask;
 202                        ip1 = ((str2ip32 (argv[0])) & mask) +1; // the '+1' is to ensure that we do not start with the net-id
 203                        ip2 = ip1 | invmask;
 204                        clipkt->ip_dst_start    = ip1;
 205                        clipkt->ip_dst_stop     = ip2;
 206                        clipkt->ip_dst_isrange  = 1;
 207                     }
 208                }
 209              else if (mops_pdesc_ip (IP2, argv[1])==0) // probably 2nd IP address?
 210                {
 211                   if (str2ip32(argv[1]) > clipkt->ip_dst_start)
 212                     {
 213                        clipkt->ip_dst_stop = str2ip32(argv[1]);
 214                        clipkt->ip_dst_isrange  = 1;
 215                     }
 216                   else
 217                     {
 218                        cli_print(cli, "Range requirement: The second IP address must be greater than the first!\n");
 219                     }
 220                }
 221              else
 222                {
 223                   cli_print(cli, "Second parameter must be either a valid IP address or a prefix length \n");
 224                }
 225           }
 226         else // first string is not a valid IP address
 227           {
 228              cli_print(cli, "First parameter must be a valid IP address\n");
 229           }
 230         break;
 231       default:
 232         cli_print(cli, "Invalid IP or range specification!\n");
 233      }
 234
 235    return CLI_OK;
 236 }
 237
 238
 239
 240
 241 int cmd_ip_version (struct cli_def *cli, char *command, char *argv[], int argc)
 242 {
 243    int ver;
 244
 245    if (strncmp(argv[argc-1], "?", 2)==0)
 246      {
 247         cli_print(cli, "Specify the IP version (default: 4).\n");
 248         return CLI_OK;
 249      }
 250
 251    ver = (int) str2int(argv[0]);
 252
 253    if (ver>15)
 254      {
 255         cli_print(cli, "Version must be within range 0..15\n");
 256         return CLI_OK;
 257      }
 258
 259    clipkt->ip_version = ver;
 260
 261    return CLI_OK;
 262 }
 263
 264
 265
 266 int cmd_ip_ttl (struct cli_def *cli, char *command, char *argv[], int argc)
 267 {
 268    int ttl;
 269
 270    if (strncmp(argv[argc-1], "?", 2)==0)
 271      {
 272         cli_print(cli, "Specify the TTL (default: 255).\n");
 273
 274         return CLI_OK;
 275      }
 276
 277    ttl = (int) str2int(argv[0]);
 278
 279    if (ttl>255)
 280      {
 281         cli_print(cli, "TTL must be within range 0..255\n");
 282         return CLI_OK;
 283      }
 284
 285    clipkt->ip_ttl = ttl;
 286
 287
 288    return CLI_OK;
 289 }
 290
 291
 292
 293 int cmd_ip_protocol (struct cli_def *cli, char *command, char *argv[], int argc)
 294 {
 295    int proto;
 296
 297    if (strncmp(argv[argc-1], "?", 2)==0)
 298      {
 299         cli_print(cli, "Specify the protocol number (default: 0).\n");
 300
 301         return CLI_OK;
 302      }
 303
 304    proto = (int) str2int(argv[0]);
 305
 306    if (proto>255)
 307      {
 308         cli_print(cli, "The protocol number must be within range 0..255\n");
 309         return CLI_OK;
 310      }
 311
 312    clipkt->ip_proto = proto;
 313
 314    return CLI_OK;
 315 }
 316
 317
 318
 319
 320
 321 int cmd_ip_hlen (struct cli_def *cli, char *command, char *argv[], int argc)
 322 {
 323    int ihl;
 324
 325    if (strncmp(argv[argc-1], "?", 2)==0)
 326      {
 327         cli_print(cli, "Specify the header length in multiple of 4 bytes.\n");
 328
 329         return CLI_OK;
 330      }
 331
 332    ihl = (int) str2int(argv[0]);
 333
 334    if (ihl>15)
 335      {
 336         cli_print(cli, "The IHL must be within range 0..15\n");
 337         return CLI_OK;
 338      }
 339
 340    clipkt->ip_IHL = ihl;
 341
 342    return CLI_OK;
 343 }
 344
 345
 346
 347
 348
 349 int cmd_ip_len (struct cli_def *cli, char *command, char *argv[], int argc)
 350 {
 351    int len;
 352
 353    if (strncmp(argv[argc-1], "?", 2)==0)
 354      {
 355         cli_print(cli, "Specify the total packet length (0..65535).\n");
 356
 357         return CLI_OK;
 358      }
 359
 360    len = (int) str2int(argv[0]);
 361
 362    if (len>65535)
 363      {
 364         cli_print(cli, "The packet length must be within range 0..65535\n");
 365         return CLI_OK;
 366      }
 367
 368    clipkt->ip_len = len;
 369
 370    return CLI_OK;
 371 }
 372
 373
 374
 375
 376
 377 int cmd_ip_id (struct cli_def *cli, char *command, char *argv[], int argc)
 378 {
 379
 380    u_int32_t id;
 381
 382    if (strncmp(argv[argc-1], "?", 2)==0)
 383      {
 384         cli_print(cli, "Specify the packet identification number (0..4294967295).\n");
 385         return CLI_OK;
 386      }
 387
 388    if (mz_strcmp(argv[0], "hex", 2)==0)
 389      {
 390         id = xstr2int (argv[1]);
 391      }
 392    else
 393      {
 394         id = str2int (argv[0]);
 395      }
 396
 397    clipkt->ip_id = id;
 398
 399    return CLI_OK;
 400 }
 401
 402
 403
 404
 405
 406
 407 int cmd_ip_offset (struct cli_def *cli, char *command, char *argv[], int argc)
 408 {
 409
 410         int offset;
 411
 412         if (strncmp(argv[argc-1], "?", 2)==0) {
 413                 cli_print(cli, "Specify the fragment offset in multiples of 8 bytes.\n");
 414                 return CLI_OK;
 415         }
 416
 417         offset = (int) str2int(argv[0]);
 418
 419         if (offset>8191) {
 420                 cli_print(cli, "The fragment offset must be within range 0..8191\n");
 421                 return CLI_OK;
 422         }
 423
 424         clipkt->ip_frag_offset = offset;
 425
 426         return CLI_OK;
 427 }
 428
 429
 430
 431
 432
 433 int cmd_ip_sum (struct cli_def *cli, char *command, char *argv[], int argc)
 434 {
 435    int sum;
 436
 437    if (strncmp(argv[argc-1], "?", 2)==0)
 438      {
 439         cli_print(cli, "Specify the IP checksum in hexadecimal or use the keyword 'auto'.\r");
 440         cli_print(cli, "By default, the checksum is computed automatically.\n");
 441         return CLI_OK;
 442      }
 443
 444    if (mz_strcmp(argv[0], "auto", 2)==0)
 445      {
 446         clipkt->ip_sum_false=0;
 447         return CLI_OK;
 448      }
 449
 450    sum = (int) xstr2int(argv[0]);
 451
 452    if (sum>0xffff)
 453      {
 454         cli_print(cli, "The checksum must be within range 0..ffff\n");
 455         return CLI_OK;
 456      }
 457
 458    clipkt->ip_sum = (u_int16_t) sum;
 459    clipkt->ip_sum_false=1;
 460
 461    return CLI_OK;
 462 }
 463
 464
 465
 466
 467
 468
 469
 470 int cmd_ip_tos (struct cli_def *cli, char *command, char *argv[], int argc)
 471 {
 472    char *tmp;
 473
 474    if (strncmp(argv[argc-1], "?", 2)==0)
 475      {
 476         cli_print(cli, "Specify the Type of Service field: <IPP> [<ToS>] [MBZ]\n");
 477         cli_print(cli, "  - IP precedence (IPP) 0..7\r");
 478         cli_print(cli, "  - ToS: delay/throughput/reliability/cost 0..15\r");
 479         cli_print(cli, "  - MBZ ('must be zero' - however, not with Mausezahn...)\r");
 480         cli_print(cli, "Or, alternatively, configure the whole byte in hex.\n");
 481         cli_print(cli, "EXAMPLES:\n");
 482         cli_print(cli, "  5          ... IPP = 5\r");
 483         cli_print(cli, "  5 9        ... IPP = 5 and ToS = 9\r");
 484         cli_print(cli, "  5 MBZ      ... IPP = 5 and MBZ is set\r");
 485         cli_print(cli, "  5 9 MBZ    ... All three fields configured\r");
 486         cli_print(cli, "  hex a8     ... the whole byte is set to 10101000\r");
 487         cli_print(cli, "  10101000   ... the whole byte in binary\n");
 488         return CLI_OK;
 489      }
 490
 491    if ((argc==1) && (mz_strisbinary(argv[0])==8))
 492      {
 493         clipkt->ip_tos = (u_int8_t) str2bin8 (argv[0]);
 494         return CLI_OK;
 495      }
 496
 497    if ((argc==2) && (mz_strcmp(argv[0], "hex", 2)==0))
 498      {
 499         tmp = argv[1];
 500
 501         if (strlen(tmp)!=2)
 502           {
 503              cli_print(cli, "You must specify a 2-digit hexadecimal value\n");
 504              return CLI_OK;
 505           }
 506
 507         if (!(isxdigit(tmp[0])) || (!(isxdigit(tmp[1]))))
 508           {
 509              cli_print(cli, "Non-hexadecimal value!\n");
 510              return CLI_OK;
 511           }
 512
 513         clipkt->ip_tos = (u_int8_t) xstr2int (tmp);
 514         return CLI_OK;
 515      }
 516
 517    switch (argc)
 518      {
 519       case 1:
 520         if (mz_strcmp(argv[0], "mbz", 1)==0)
 521           {
 522              mops_ip_tos(clipkt, -1, -1, 1);
 523           }
 524         else
 525           {
 526              if (mops_ip_tos(clipkt, (int)str2int(argv[0]), -1, 0))
 527                cli_print(cli, "Invalid IP Precedence value\n");
 528           }
 529         break;
 530
 531       case 2:
 532         if (mz_strcmp(argv[1], "mbz", 1)==0)
 533           {
 534              if (mops_ip_tos(clipkt, (int)str2int(argv[0]), -1, 1))
 535                cli_print(cli, "Invalid IP Precedence value\n");
 536           }
 537         else
 538           {
 539              if (mops_ip_tos(clipkt, (int)str2int(argv[0]), (int)str2int(argv[1]), 0))
 540                cli_print(cli, "Invalid values\n");
 541           }
 542         break;
 543
 544       case 3:
 545         if (mz_strcmp(argv[2], "mbz", 1)!=0)
 546           cli_print(cli, "In this case the 3rd argument must be 'mbz'\n");
 547         else
 548           if (mops_ip_tos(clipkt, (int)str2int(argv[0]), (int)str2int(argv[1]),  1))
 549             cli_print(cli, "Invalid values\n");
 550         break;
 551      }
 552
 553    return CLI_OK;
 554 }
 555
 556
 557
 558
 559
 560
 561
 562 int cmd_ip_dscp (struct cli_def *cli, char *command, char *argv[], int argc)
 563 {
 564    if ((argc!=1) || (strncmp(argv[argc-1], "?", 2)==0))
 565      {
 566         cli_print(cli, "Specify the Type of Service field using the DSCP format.\r");
 567         cli_print(cli, "Multiple notations are supported.\n");
 568         cli_print(cli, "Examples:\r");
 569         cli_print(cli, "    AF32        .... specify AF codepoint with class 3 and drop probability 2\r");
 570         cli_print(cli, "    EF          .... specify Expedited Forwarding\r");
 571         cli_print(cli, "    CS7         .... specify Code Selector 7\r");
 572         cli_print(cli, "    101110      .... specify the DSCP in binary\r");
 573         cli_print(cli, "    56          .... specify the DSCP in decimal\r");
 574         cli_print(cli, "\r");
 575         return CLI_OK;
 576      }
 577
 578    switch (mops_ip_dscp(clipkt, argv[0]))
 579      {
 580       case -1:
 581         cli_print(cli, "Invalid DSCP specification (use '?')\n");
 582         break;
 583       case 1:
 584         cli_print(cli, "Invalid AF code point (use '?')\n");
 585         break;
 586       case 2:
 587         cli_print(cli, "Invalid Code Selector (CS0..CS7)\n");
 588         break;
 589       case 3:
 590         cli_print(cli, "Invalid DSCP value (0..63)\n");
 591         break;
 592      }
 593
 594    return CLI_OK;
 595 }
 596
 597
 598
 599
 600
 601 int cmd_ip_rsv (struct cli_def *cli, char *command, char *argv[], int argc)
 602 {
 603
 604    if (strncmp(argv[argc-1], "?", 2)==0)
 605      {
 606         cli_print(cli, "Set or unset the reserved flag.\n");
 607         return CLI_OK;
 608      }
 609
 610    if (argc!=1)
 611      {
 612         cli_print(cli, "Use the 'set' or 'unset' keywords.\n");
 613         return CLI_OK;
 614      }
 615
 616
 617    if (mz_strcmp(argv[0], "set", 1)==0)
 618      {
 619         clipkt->ip_flags_RS = 1;
 620         return CLI_OK;
 621      }
 622
 623    if (mz_strcmp(argv[0], "unset", 1)==0)
 624      {
 625         clipkt->ip_flags_RS = 0;
 626         return CLI_OK;
 627      }
 628
 629    cli_print(cli, "Unknown keyword. Use the 'set' or 'unset' keywords.\n");
 630
 631    return CLI_OK;
 632
 633 }
 634
 635
 636
 637
 638
 639 int cmd_ip_df (struct cli_def *cli, char *command, char *argv[], int argc)
 640 {
 641
 642    if (strncmp(argv[argc-1], "?", 2)==0)
 643      {
 644         cli_print(cli, "Set or unset the don't fragment flag.\n");
 645
 646         return CLI_OK;
 647      }
 648
 649    if (argc!=1)
 650      {
 651         cli_print(cli, "Use the 'set' or 'unset' keywords.\n");
 652         return CLI_OK;
 653      }
 654
 655
 656    if (mz_strcmp(argv[0], "set", 1)==0)
 657      {
 658         clipkt->ip_flags_DF = 1;
 659         return CLI_OK;
 660      }
 661
 662    if (mz_strcmp(argv[0], "unset", 1)==0)
 663      {
 664         clipkt->ip_flags_DF = 0;
 665         return CLI_OK;
 666      }
 667
 668    cli_print(cli, "Unknown keyword. Use the 'set' or 'unset' keywords.\n");
 669
 670
 671    return CLI_OK;
 672
 673 }
 674
 675
 676
 677
 678
 679 int cmd_ip_mf (struct cli_def *cli, char *command, char *argv[], int argc)
 680 {
 681
 682    if (strncmp(argv[argc-1], "?", 2)==0)
 683      {
 684         cli_print(cli, "Set or unset the more fragments flag.\n");
 685
 686         return CLI_OK;
 687      }
 688
 689    if (argc!=1)
 690      {
 691         cli_print(cli, "Use the 'set' or 'unset' keywords.\n");
 692         return CLI_OK;
 693      }
 694
 695
 696    if (mz_strcmp(argv[0], "set", 1)==0)
 697      {
 698         clipkt->ip_flags_MF = 1;
 699         return CLI_OK;
 700      }
 701
 702    if (mz_strcmp(argv[0], "unset", 1)==0)
 703      {
 704         clipkt->ip_flags_MF = 0;
 705         return CLI_OK;
 706      }
 707
 708    cli_print(cli, "Unknown keyword. Use the 'set' or 'unset' keywords.\n");
 709
 710    return CLI_OK;
 711
 712 }
 713
 714
 715 int cmd_ip_fragsize (struct cli_def *cli, char *command, char *argv[], int argc)
 716 {
 717         u_int32_t fragsize=0;
 718
 719         if (strncmp(argv[argc-1], "?", 2)==0) {
 720                 cli_print(cli, "Enable fragmentation by configuring a fragment size.\n");
 721                 cli_print(cli, "Note that the fragment size specifies the number of bytes in the IP payload\r");
 722                 cli_print(cli, "and NOT the assumed MTU on that link. The total packet size of each fragment\r");
 723                 cli_print(cli, "will be 20 bytes larger (=size of IP header if no IP options are used).\n");
 724                 cli_print(cli, "WARNING: The fragment size SHOULD be a multiple of 8 bytes if you expect\r");
 725                 cli_print(cli, "         a valid result.\n");
 726                 cli_print(cli, "ARGUMENTS: <frag-size>\n");
 727                 return CLI_OK;
 728         }
 729
 730         if (argc!=1) {
 731                 cli_print(cli, "Specify the fragment size in bytes.\n");
 732                 return CLI_OK;
 733         }
 734
 735
 736         fragsize = (u_int32_t) str2int(argv[0]);
 737
 738         if ((fragsize<0) || (fragsize>8000)) {
 739                 cli_print(cli, "The fragment size must be within range 0..8000\n");
 740                 return CLI_OK;
 741         }
 742
 743         if (fragsize%8) {
 744                 cli_print(cli, "Warning: The fragment-size is not a multiple of 8.\n");
 745         }
 746
 747         clipkt->ip_fragsize = fragsize;
 748
 749         return CLI_OK;
 750
 751 }
 752
 753
 754
 755 int cmd_ip_fragoverlap (struct cli_def *cli, char *command, char *argv[], int argc)
 756 {
 757         u_int32_t overlap=0;
 758
 759         if (strncmp(argv[argc-1], "?", 2)==0) {
 760                 cli_print(cli, "Specify how many bytes should overlap when IP fragmentation is enabled.\n");
 761                 cli_print(cli, "NOTE: The number of overlap bytes is either 0 (default, no overlap) or\r");
 762                 cli_print(cli, "      a multiple of 8 bytes but smaller than frag-size.\n");
 763                 cli_print(cli, "ARGUMENTS: <overlap>\n");
 764                 return CLI_OK;
 765         }
 766
 767         if (argc!=1) {
 768                 cli_print(cli, "Specify how many bytes should overlap between successive IP fragments.\n");
 769                 return CLI_OK;
 770         }
 771
 772
 773         overlap = (u_int32_t) str2int(argv[0]);
 774
 775         if (clipkt->ip_fragsize == 0) {
 776                 cli_print(cli, "Please configure the fragment size first.\n");
 777                 return CLI_OK;
 778         }
 779
 780         if ((overlap>clipkt->ip_fragsize) || (overlap%8)) {
 781                 cli_print(cli, "The overlap MUST be a multiple of 8 and MUST NOT exceed frag-size!\n");
 782                 return CLI_OK;
 783         }
 784
 785         clipkt->ip_frag_overlap = overlap;
 786
 787         return CLI_OK;
 788 }
 789
 790
 791
 792
 793
 794 int cmd_ip_option (struct cli_def *cli, char *command, char *argv[], int argc)
 795 {
 796         int val=0;
 797
 798         if ((strncmp(argv[argc-1], "?", 2)==0) || (argc==0)) {
 799                 cli_print(cli, "Add or delete IP options.\n");
 800                 cli_print(cli, "You can only add one option after the other; if you want to configure multiple\r");
 801                 cli_print(cli, "options then repeat this command. The options are added to the IP header in the\r");
 802                 cli_print(cli, "same order as you configure them.\n");
 803                 cli_print(cli, "Currently the following options are supported:\n");
 804                 cli_print(cli, "router-alert [<value>]   ... signal transit routers to examine the content of this\r");
 805                 cli_print(cli, "                             packet.\r");
 806                 cli_print(cli, "\n");
 807                 cli_print(cli, "clear  ..................... remove all options from the packet\n");
 808                 return CLI_OK;
 809         }
 810
 811         if (mz_strcmp(argv[0], "router-alert", 3)==0) {
 812                 switch (argc) {
 813                  case 1:
 814                         val=0;
 815                         break;
 816                  case 2:
 817                         val = (int) str2int(argv[1]);
 818                         break;
 819                  default:
 820                         cli_print(cli, "Too many arguments!\n");
 821                         return CLI_OK;
 822                 }
 823                 if (mops_ip_option_ra (clipkt, val)) {
 824                         cli_print(cli, "Value must be within 0..65535\n");
 825                         return CLI_OK;
 826                 }
 827
 828         } else if (mz_strcmp(argv[0], "loose-source-route", 3)==0) {
 829                 cli_print(cli, "Currently not implemented\n");
 830                 return CLI_OK;
 831         } else if (mz_strcmp(argv[0], "record-route", 3)==0) {
 832                 cli_print(cli, "Currently not implemented\n");
 833                 return CLI_OK;
 834         }
 835
 836         else if (mz_strcmp(argv[0], "clear", 2)==0) {
 837                 mops_ip_option_remove_all (clipkt);
 838         }
 839
 840    return CLI_OK;
 841 }
 842
 843
 844
 845 // By default we use ARP to determine the destination MAC and therefore support
 846 // automatic (in)direct delivery of IP packets. Alternatively the user may turn
 847 // this off and may configure an arbitrary destination MAC address
 848 //
 849 int cmd_ip_delivery (struct cli_def *cli, char *command, char *argv[], int argc)
 850 {
 851         char str[16];
 852         if (strncmp(argv[argc-1], "?", 2)==0) {
 853                 cli_print(cli, "Enable or disable IP auto-delivery.\n");
 854                 sprintf(str, "%s", (clipkt->auto_delivery_off) ? "DISABLED" : "ENABLED");
 855                 cli_print(cli, "Currently, IP auto-delivery is %s\n", str);
 856                 return CLI_OK;
 857         }
 858
 859         if (argc!=1) {
 860                 cli_print(cli, "Argument missing. Enter either 'enable' or 'disable'\n");
 861                 return CLI_OK;
 862         }
 863
 864         if (mz_strcmp(argv[0], "enable", 1)==0)
 865                 clipkt->auto_delivery_off=0;
 866         else if (mz_strcmp(argv[0], "disable", 1)==0)
 867                 clipkt->auto_delivery_off=1;
 868         else {
 869                 cli_print(cli, "Unknown keyword.  Enter either 'enable' or 'disable'\n");
 870                 return CLI_OK;
 871         }
 872
 873         sprintf(str, "%s", (clipkt->auto_delivery_off) ? "DISABLED" : "ENABLED");
 874         cli_print(cli, "IP auto-delivery is now %s\n", str);
 875
 876         return CLI_OK;
 877
 878 }
 879
 880
 881
 882 int cmd_ip_end(struct cli_def *cli, char *command, char *argv[], int argc)
 883 {
 884    char prompt[16];
 885    sprintf(prompt, "pkt-%i",clipkt->id);
 886    cli_set_configmode(cli, MZ_MODE_PACKET, prompt);
 887    return CLI_OK;
 888 }